PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/20-08:57:50
G01     69.4           32.8                4.9 +/-    0.73       8.0 +/-    0.73  0.030 / 0.040
G07     138.0          28.7                6.0 +/-    1.44      10.8 +/-    1.44  0.040 / 0.040
G11     51.9           28.7                2.8 +/-    1.06       5.0 +/-    1.06  0.050 / 0.110
G13     272.4          37.7                5.9 +/-    0.79       8.9 +/-    0.79  0.050 / 0.120
G15     304.7          13.6                1.8 +/-    1.84       4.7 +/-    1.84  0.050 / 0.080
G17     237.0          72.6                6.0 +/-    0.63       6.3 +/-    0.63  0.080 / 0.080
G18     46.6           16.2                1.6 +/-    1.26       3.9 +/-    1.26  0.130 / 0.330
G19     224.7          39.4                6.7 +/-    1.19       9.8 +/-    1.19  0.140 / 0.360
G28     19.2           59.5                4.7 +/-    0.67       5.4 +/-    0.67  0.050 / 0.120
G30     137.0          62.5                7.0 +/-    0.95       7.8 +/-    0.95  0.090 / 0.110